Back pack



FIG. 1 is a rear perspective view of a back pack incorporating features of the invention.

FIG. 2 is a rear view of the back pack of FIG. 1

FIG. 3 is a bottom view of the back pack of FIG. 1.

FIG. 4 is a front view of the back pack of FIG. 1.

FIG. 5 is a right side view of the back pack of FIG. 1.

FIG. 6 is a left side view of the back pack of FIG. 1; and,

FIG. 7 is a top view of the back pack of FIG. 1. 

CLAIM The ornamental design for a back pack, as shown and described. 